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Intangible Assets Intangible Assets
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

Gross carrying amounts and accumulated amortization of finite-lived intangible assets by major class at December 31 were as follows:

 
December 31, 2018
 
December 31, 2017
 
Gross
 
Accumulated amortization
 
Net
 
Gross
 
Accumulated amortization
 
Net
Customer relationships
$
1,615

 
$
(206
)
 
1,409

 
$
461

 
$
(108
)
 
$
353

Trade names
547

 
(17
)
 
530

 
—

 
—

 
—

Technology
160

 
(18
)
 
142

 
—

 
—

 
—

Long term supply contracts
143

 
(37
)
 
106

 
143

 
(27
)
 
116

 
$
2,465

 
$
(278
)
 
$
2,187

 
$
604

 
$
(135
)
 
$
469



The table above excludes other intangible assets with net balances of $6 and $3 at December 31, 2018 and 2017.

Amortization expense for the years ended December 31, 2018, 2017, and 2016 was $148, $39 and $41.

Annual amortization expense for each of the five years subsequent to 2018 is estimated to be $182.